Alex Parvulescu created OAK-3603:
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Summary: Evaluate skipping cleanup of a subset of tar files
Key: OAK-3603
URL: https://issues.apache.org/jira/browse/OAK-3603
Project: Jackrabbit Oak
Issue Type: Improvement
Components: segmentmk
Reporter: Alex Parvulescu
Assignee: Alex Parvulescu
Given the fact that tar readers are immutable (we only create new generations
of them once they reach a certain threshold of garbage) we can consider coming
up with a heuristic for skipping cleanup entirely for consequent cleanup calls
based on the same referenced id set (provided we can make this set more stable,
aka. OAK-2849).
Ex: for a specific input set a cleanup call on a tar reader might decide that
there's no enough garbage (some IO involved in reading through all existing
entries). if the following cleanup cycle would have the exact same input, it
doesn't make sense to recheck the tar file, we already know cleanup can be
skipped, moreover we can skip the older tar files too, as their input would
also not change. the gains increase the larger the number of tar files.
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